The trailer is CGI, and made by Digic Pictures as HennieSteps has said. The lyrics go as such:
"Wolves asleep amidst the trees,
Bats all a'swaying in the breeze,
But one soul lies anxious,
Wide awake,
Fearing all manner of ghouls, hags, and wraiths,
Birds are silent for the night,
Cows turned in as daylight dies,
But one soul lies anxious,
Wide awake,
For the witcher brave and bold,
Paid in coin of gold,
He'll chop and slice you,
Cut and dice you,
Eat you up whole,
Eat you whole"
The music playing in the background is called
Hole in the Sun by Two Steps from Hell, a music production company that has written tons of songs for trailers for big name movies and games.
That's all I know, though. Hope I helped.
